#ifndef IO_MGR_H_
#define IO_MGR_H_

/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2011-2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
 * Copyright (C) 2016-2020 Kicad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <richio.h>
#include <map>
#include <functional>
#include <wx/time.h>

#include <config.h>

class BOARD;
class PLUGIN;
class FOOTPRINT;
class PROPERTIES;
class PROJECT;

/**
 * A factory which returns an instance of a #PLUGIN.
 */
class IO_MGR
{
public:

    /**
     * The set of file types that the IO_MGR knows about, and for which there has been a
     * plugin written.
     */
    enum PCB_FILE_T
    {
        LEGACY,     ///< Legacy Pcbnew file formats prior to s-expression.
        KICAD_SEXP, ///< S-expression Pcbnew file format.
        EAGLE,
        PCAD,
        FABMASTER,
        ALTIUM_DESIGNER,
        ALTIUM_CIRCUIT_STUDIO,
        ALTIUM_CIRCUIT_MAKER,
        CADSTAR_PCB_ARCHIVE,
        GEDA_PCB, ///< Geda PCB file formats.
        // add your type here.

        // etc.

        FILE_TYPE_NONE
    };

    /**
     * Hold a list of available plugins, created using a singleton REGISTER_PLUGIN object.
     * This way, plugins can be added link-time.
     */
    class PLUGIN_REGISTRY
    {
        public:
            struct ENTRY
            {
                PCB_FILE_T m_type;
                std::function<PLUGIN*(void)> m_createFunc;
                wxString m_name;
            };

            static PLUGIN_REGISTRY *Instance()
            {
                static PLUGIN_REGISTRY *self = nullptr;

                if( !self )
                {
                    self = new PLUGIN_REGISTRY;
                }
                return self;
            }

            void Register( PCB_FILE_T aType, const wxString& aName,
                           std::function<PLUGIN*(void)> aCreateFunc )
            {
                ENTRY ent;
                ent.m_type = aType;
                ent.m_createFunc = aCreateFunc;
                ent.m_name = aName;
                m_plugins.push_back( ent );
            }

            PLUGIN* Create( PCB_FILE_T aFileType ) const
            {
                for( auto& ent : m_plugins )
                {
                    if ( ent.m_type == aFileType )
                    {
                        return ent.m_createFunc();
                    }
                }

                return nullptr;
            }

            const std::vector<ENTRY>& AllPlugins() const
            {
                return m_plugins;
            }

        private:
            std::vector<ENTRY> m_plugins;
    };

    /**
     * Register a plugin.
     *
     * Declare as a static variable in an anonymous namespace.
     *
     * @param aType type of the plugin
     * @param aName name of the file format
     * @param aCreateFunc function that creates a new object for the plugin.
     */
    struct REGISTER_PLUGIN
    {
         REGISTER_PLUGIN( PCB_FILE_T aType, const wxString& aName,
                          std::function<PLUGIN*(void)> aCreateFunc )
         {
             PLUGIN_REGISTRY::Instance()->Register( aType, aName, aCreateFunc );
         }
    };


    /**
     * Return a #PLUGIN which the caller can use to import, export, save, or load
     * design documents.
     *
     * The returned #PLUGIN, may be reference counted, so please call PluginRelease() when you
     * are done using the returned #PLUGIN.  It may or may not be code running from a DLL/DSO.
     *
     * @note The caller owns the returned object and must call PluginRelease when done using it.
     *
     * @param aFileType is from #PCB_FILE_T and tells which plugin to find.
     * @return the plug in corresponding to \a aFileType or NULL if not found.
     */
    static PLUGIN* PluginFind( PCB_FILE_T aFileType );

    /**
     * Release a #PLUGIN back to the system and may cause it to be unloaded from memory.
     *
     * @param aPlugin is the one to be released, and which is no longer usable
     *                after calling this.
     */
    static void PluginRelease( PLUGIN* aPlugin );

    /**
     * Return a brief name for a plugin given \a aFileType enum.
     */
    static const wxString ShowType( PCB_FILE_T aFileType );

    /**
     * Return the #PCB_FILE_T from the corresponding plugin type name: "kicad", "legacy", etc.
     */
    static PCB_FILE_T EnumFromStr( const wxString& aFileType );

    /**
     * Return the file extension for \a aFileType.
     *
     * @param aFileType The #PCB_FILE_T type.
     * @return the file extension for \a aFileType or an empty string if \a aFileType is invalid.
     */
    static const wxString GetFileExtension( PCB_FILE_T aFileType );

    /**
     * Return a plugin type given a footprint library's libPath.
     */
    static PCB_FILE_T GuessPluginTypeFromLibPath( const wxString& aLibPath );

    /**
     * Find the requested #PLUGIN and if found, calls the #PLUGIN::Load() function
     * on it using the arguments passed to this function.  After the #PLUGIN::Load()
     * function returns, the #PLUGIN is Released() as part of this call.
     *
     * @param aFileType is the #PCB_FILE_T of file to load.
     * @param aFileName is the name of the file to load.
     * @param aAppendToMe is an existing BOARD to append to, use NULL if fresh
     *                    board load is wanted.
     * @param aProperties is an associative array that allows the caller to
     *                    pass additional tuning parameters to the PLUGIN.
     * @param aProject is the optional #PROJECT object primarily used by third party
     *                 importers.
     * @return the loaded #BOARD object.  The  caller owns it an it will never NULL because
     *         exception thrown if error.
     *
     * @throw IO_ERROR if the #PLUGIN cannot be found, file cannot be found, or file cannot
     *                 be loaded.
     */
    static BOARD* Load( PCB_FILE_T aFileType, const wxString& aFileName,
                        BOARD* aAppendToMe = nullptr, const PROPERTIES* aProperties = nullptr,
                        PROJECT* aProject = nullptr );

    /**
     * Write either a full \a aBoard to a storage file in a format that this implementation
     * knows about, or it can be used to write a portion of\a aBoard to a special kind of
     * export file.
     *
     * @param aFileType is the #PCB_FILE_T of file to save.
     * @param aFileName is the name of a file to save to on disk.
     * @param aBoard is the #BOARD document (data tree) to save or export to disk.
     * @param aBoard is the in memory document tree from which to extract information when
     *               writing to \a aFileName.  The caller continues to own the #BOARD, and
     *               the plugin should refrain from modifying the #BOARD if possible.
     * @param aProperties is an associative array that can be used to tell the saver how to
     *                    save the file, because it can take any number of additional named
     *                    tuning arguments that the plugin is known to support.  The caller
     *                    continues to own this object (plugin may not delete it), and plugins
     *                     should expect it to be optionally NULL.
     *
     * @throw IO_ERROR if there is a problem saving or exporting.
     */
    static void Save( PCB_FILE_T aFileType, const wxString& aFileName, BOARD* aBoard,
                      const PROPERTIES* aProperties = nullptr );
};


/**
 * A base class that #BOARD loading and saving plugins should derive from.
 *
 * Implementations can provide either Load() or Save() functions, or both.  PLUGINs throw
 * exceptions, so it is best that you wrap your calls to these functions in a try catch block.
 * Plugins throw exceptions because it is illegal for them to have any user interface calls in
 * them whatsoever, i.e. no windowing or screen printing at all.
 *
 *The compiler writes the "zero argument" constructor for a PLUGIN automatically if you do
 * not provide one.  If you decide you need to provide a zero argument constructor of your
 * own design, that is allowed.  It must be public, and it is what the #IO_MGR uses.  Parameters
 * may be passed into a PLUGIN via the #PROPERTIES variable for any of the public API functions
 * which take one.
 *
 *
 * <pre>
 *   try
 *   {
 *        IO_MGR::Load(...);
 *   or
 *        IO_MGR::Save(...);
 *   }
 *   catch( const IO_ERROR& ioe )
 *   {
 *        // grab text from ioe, show in error window.
 *   }
 * </pre>
 */
class PLUGIN
{
public:
    /**
     * Return a brief hard coded name for this PLUGIN.
     */
    virtual const wxString PluginName() const = 0;

    /**
     * Returns the file extension for the PLUGIN.
     */
    virtual const wxString GetFileExtension() const = 0;

    /**
     * Load information from some input file format that this PLUGIN implementation
     * knows about into either a new #BOARD or an existing one.
     *
     * This may be used to load an entire new #BOARD, or to augment an existing one if
     * @a aAppendToMe is not NULL.
     *
     * @param aFileName is the name of the file to use as input and may be foreign in
     *                  nature or native in nature.
     * @param aAppendToMe is an existing BOARD to append to, but if NULL then this means
     *                    "do not append, rather load anew".
     * @param aProperties is an associative array that can be used to tell the loader how to
     *                    load the file, because it can take any number of additional named
     *                    arguments that the plugin is known to support. These are tuning
     *                    parameters for the import or load.  The caller continues to own
     *                    this object (plugin may not delete it), and plugins should expect
     *                    it to be optionally NULL.
     * @param aProject is the optional #PROJECT object primarily used by third party
     *                 importers.
     * @return the successfully loaded board, or the same one as \a aAppendToMe if aAppendToMe
     *         was not NULL, and caller owns it.
     *
     * @throw IO_ERROR if there is a problem loading, and its contents should say what went
     *                 wrong, using line number and character offsets of the input file if
     *                 possible.
     */
    virtual BOARD* Load( const wxString& aFileName, BOARD* aAppendToMe,
                         const PROPERTIES* aProperties = nullptr, PROJECT* aProject = nullptr );

    /**
     * Return a container with the cached library footprints generated in the last call to
     * #Load. This function is intended to be used ONLY by the non-KiCad board importers for the
     * purpose of obtaining the footprint library of the design and creating a project-specific
     * library.
     *
     * @return Footprints (caller owns the objects)
     */
    virtual std::vector<FOOTPRINT*> GetImportedCachedLibraryFootprints();

    /**
     * Write @a aBoard to a storage file in a format that this PLUGIN implementation knows
     * about or it can be used to write a portion of \a aBoard to a special kind of export
     * file.
     *
     * @param aFileName is the name of a file to save to on disk.
     * @param aBoard is the class #BOARD in memory document tree from which to extract
     *               information when writing to \a aFileName.  The caller continues to
     *               own the BOARD, and the plugin should refrain from modifying the BOARD
     *               if possible.
     * @param aProperties is an associative array that can be used to tell the saver how to
     *                    save the file, because it can take any number of additional named
     *                    tuning arguments that the plugin is known to support.  The caller
     *                    continues to own this object (plugin may not delete it) and plugins
     *                    should expect it to be optionally NULL.
     *
     * @throw IO_ERROR if there is a problem saving or exporting.
     */
    virtual void Save( const wxString& aFileName, BOARD* aBoard,
                       const PROPERTIES* aProperties = nullptr );

    /**
     * Return a list of footprint names contained within the library at @a aLibraryPath.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file,
     *                     or URL containing several footprints.
     * @param aProperties is an associative array that can be used to tell the plugin
     *                    anything needed about how to perform with respect to @a aLibraryPath.
     *                    The caller continues to own this object (plugin may not delete it),
     *                    and plugins should expect it to be optionally NULL.
     * @param aFootprintNames is the array of available footprint names inside a library.
     * @param aBestEfforts if true, don't throw on errors, just return an empty list.
     *
     * @throw IO_ERROR if the library cannot be found, or footprint cannot be loaded.
     */
    virtual void FootprintEnumerate( wxArrayString& aFootprintNames, const wxString& aLibraryPath,
                                     bool aBestEfforts, const PROPERTIES* aProperties = nullptr );

    /**
     * Generate a timestamp representing all the files in the library (including the library
     * directory).
     *
     * Timestamps should not be considered ordered, they either match or they don't.
     */
    virtual long long GetLibraryTimestamp( const wxString& aLibraryPath ) const = 0;

    /**
     * If possible, prefetches the specified library (e.g. performing downloads). Does not parse.
     * Threadsafe.
     *
     * This is a no-op for libraries that cannot be prefetched.  Plugins that cannot prefetch
     * need not override this; a default no-op is provided.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file, or URL
     *                     containing several footprints.
     *
     * @param aProperties is an associative array that can be used to tell the plugin anything
     *                    needed about how to perform with respect to @a aLibraryPath.  The
     *                    caller continues to own this object (plugin may not delete it), and
     *                    plugins should expect it to be optionally NULL.
     *
     * @throw IO_ERROR if there is an error prefetching the library.
     */
    virtual void PrefetchLib( const wxString& aLibraryPath,
            const PROPERTIES* aProperties = nullptr );

    /**
     * Load a footprint having @a aFootprintName from the @a aLibraryPath containing a library
     * format that this PLUGIN knows about.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file, or URL
     *                     containing several footprints.
     * @param aFootprintName is the name of the footprint to load.
     * @param aProperties is an associative array that can be used to tell the loader
     *                    implementation to do something special, because it can take
     *                    any number of  additional named tuning arguments that the plugin
     *                    is known to support.  The caller continues to own this object
     *                    (plugin may not delete it), and plugins should expect it to be
     *                    optionally NULL.
     * @return the #FOOTPRINT object if found caller owns it, else NULL if not found.
     *
     * @throw   IO_ERROR if the library cannot be found or read.  No exception is thrown in
     *                   the case where \a aFootprintName cannot be found.
     */
    virtual FOOTPRINT* FootprintLoad( const wxString& aLibraryPath, const wxString& aFootprintName,
                                      const PROPERTIES* aProperties = nullptr );

    /**
     * A version of FootprintLoad() for use after FootprintEnumerate() for more efficient
     * cache management.
     */
    virtual const FOOTPRINT* GetEnumeratedFootprint( const wxString& aLibraryPath,
                                                     const wxString& aFootprintName,
                                                     const PROPERTIES* aProperties = nullptr );

    /**
     * Check for the existence of a footprint.
     */
    virtual bool FootprintExists( const wxString& aLibraryPath, const wxString& aFootprintName,
                                  const PROPERTIES* aProperties = nullptr );

    /**
     * Write @a aFootprint to an existing library located at @a aLibraryPath.
     * If a footprint by the same name already exists, it is replaced.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file, or URL
     *                      containing several footprints.
     * @param aFootprint is what to store in the library. The caller continues to own the
     *                   footprint after this call.
     * @param aProperties is an associative array that can be used to tell the saver how to
     *                    save the footprint, because it can take any number of additional
     *                    named tuning arguments that the plugin is known to support.  The
     *                    caller continues to own this object (plugin may not delete it), and
     *                    plugins should expect it to be optionally NULL.
     *
     * @throw IO_ERROR if there is a problem saving.
     */
    virtual void FootprintSave( const wxString& aLibraryPath, const FOOTPRINT* aFootprint,
                                const PROPERTIES* aProperties = nullptr );

    /**
     * Delete @a aFootprintName from the library at @a aLibraryPath.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file, or URL
     *                     containing several footprints.
     * @param aFootprintName is the name of a footprint to delete from the specified library.
     * @param aProperties is an associative array that can be used to tell the library delete
     *                    function anything special, because it can take any number of additional
     *                    named tuning arguments that the plugin is known to support.  The caller
     *                    continues to own this object (plugin may not delete it), and plugins
     *                    should expect it to be optionally NULL.
     *
     * @throw IO_ERROR if there is a problem finding the footprint or the library, or deleting it.
     */
    virtual void FootprintDelete( const wxString& aLibraryPath, const wxString& aFootprintName,
                                  const PROPERTIES* aProperties = nullptr );

    /**
     * Create a new empty footprint library at @a aLibraryPath empty.
     *
     * It is an error to attempt to create an existing library or to attempt to create
     * on a "read only" location.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file, or URL
     *                     containing several footprints.
     * @param aProperties is an associative array that can be used to tell the library create
     *                    function anything special, because it can take any number of additional
     *                    named tuning arguments that the plugin is known to support.  The caller
     *                    continues to own this object (plugin may not delete it), and plugins
     *                    should expect it to be optionally NULL.
     *
     * @throw IO_ERROR if there is a problem finding the library, or creating it.
     */
    virtual void FootprintLibCreate( const wxString& aLibraryPath,
                                     const PROPERTIES* aProperties = nullptr );

    /**
     * Delete an existing footprint library and returns true, or if library does not
     * exist returns false, or throws an exception if library exists but is read only or
     * cannot be deleted for some other reason.
     *
     * @param aLibraryPath is a locator for the "library", usually a directory or file which
     *                     will contain footprints.
     * @param aProperties is an associative array that can be used to tell the library delete
     *                    implementation function anything special, because it can take any
     *                    number of additional named tuning arguments that the plugin is known
     *                    to support. The caller continues to own this object (plugin may not
     *                    delete it), and plugins should expect it to be optionally NULL.
     * @return true if library deleted, false if library did not exist.
     *
     * @throw IO_ERROR if there is a problem deleting an existing library.
     */
    virtual bool FootprintLibDelete( const wxString& aLibraryPath,
                                     const PROPERTIES* aProperties = nullptr );

    /**
     * Return true if the library at @a aLibraryPath is writable.
     *
     * The system libraries are typically read only because of where they are installed..
     *
     * @param aLibraryPath is a locator for the "library", usually a directory, file, or URL
     *                     containing several footprints.
     *
     * @throw IO_ERROR if no library at aLibraryPath exists.
     */
    virtual bool IsFootprintLibWritable( const wxString& aLibraryPath );

    /**
     * Append supported PLUGIN options to @a aListToAppenTo along with internationalized
     * descriptions.
     *
     * Options are typically appended so that a derived #PLUGIN can call its base class
     * function by the same name first, thus inheriting options declared there.  Some base
     * class options could pertain to all Footprint*() functions in all derived PLUGINs.
     *
     * @note Since aListToAppendTo is a #PROPERTIES object, all options will be unique and
     *       last guy wins.
     *
     * @param aListToAppendTo holds a tuple of
     * <dl>
     *  <dt>option</dt>
     *  <dd>This eventually is what shows up into the fp-lib-table "options"
     *      field, possibly combined with others.</dd>
     *  <dt>internationalized description</dt>
     *  <dd>The internationalized description is displayed in DIALOG_FP_PLUGIN_OPTIONS.
     *      It may be multi-line and be quite explanatory of the option.</dd>
     * </dl>
     * <br>
     *  In the future perhaps @a aListToAppendTo evolves to something capable of also
     *  holding a wxValidator for the cells in said dialog:
     *  http://forums.wxwidgets.org/viewtopic.php?t=23277&p=104180.
     *  This would require a 3 column list, and introducing wx GUI knowledge to
     * PLUGIN, which has been avoided to date.
     */
    virtual void FootprintLibOptions( PROPERTIES* aListToAppendTo ) const;

    virtual ~PLUGIN()
    {
        //printf( "~%s", __func__ );
    };


#ifndef SWIG
    /**
     * Releases a PLUGIN in the context of a potential thrown exception through its destructor.
     */
    class RELEASER
    {
        PLUGIN* plugin;

        // private assignment operator so it's illegal
        RELEASER& operator=( RELEASER& aOther ) { return *this; }

        // private copy constructor so it's illegal
        RELEASER( const RELEASER& aOther ) : plugin( nullptr ) {}

    public:
        RELEASER( PLUGIN* aPlugin = nullptr ) :
            plugin( aPlugin )
        {
        }

        ~RELEASER()
        {
            if( plugin )
                release();
        }

        void release()
        {
            IO_MGR::PluginRelease( plugin );
            plugin = nullptr;
        }

        void set( PLUGIN* aPlugin )
        {
            if( plugin )
                release();
            plugin = aPlugin;
        }

        operator PLUGIN* () const
        {
            return plugin;
        }

        PLUGIN* operator -> () const
        {
            return plugin;
        }
    };
#endif
};

#endif // IO_MGR_H_
